The human resources manager of a local water-bottling company wants to conduct a survey to estimate the proportion of employees happy with the physical appearance of the company buildings and grounds. The manager is considering two methods of obtaining a sample of 550 employees from the 3,500 employees at the company.

Part A: Because of the large number of employees at the company, the first method the manager is considering consists of using a computer with a random-number generator to select a simple random sample of 550 employees from a list of 3,500 employee names. Describe how to implement such a method. (5 points)

Part B: Because stratification can often provide a more precise estimate than a simple random sample, the second method the manager is considering consists of selecting a stratified random sample of 550 employees. The company has two campuses, with male and female employees at each campus. Under what circumstance(s) would stratification by campus provide a more precise estimate of the proportion of employees who are satisfied with the appearance of the company buildings and grounds than stratification by gender? (5 points) (10 points)